Year | Value | 2021 | 68.415 | 2020 | 68.804 | 2019 | 68.671 | 2018 | 68.123 | 2017 | 68.078 | 2016 | 67.927 | 2015 | 67.818 | 2014 | 67.058 | 2013 | 66.761 | 2012 | 66.439 | 2011 | 66.121 | 2010 | 65.268 | 2009 | 65.096 | 2008 | 64.787 | 2007 | 63.861 | 2006 | 63.872 | 2005 | 63.937 | 2004 | 64.021 | 2003 | 63.932 | 2002 | 63.828 | 2001 | 63.852 | 2000 | 63.785 | 1999 | 63.828 | 1998 | 62.732 | 1997 | 63.656 | 1996 | 63.477 | 1995 | 63.439 | 1994 | 63.2 | 1993 | 62.956 | 1992 | 62.775 | 1991 | 62.47 | 1990 | 62.386 | 1989 | 62.256 | 1988 | 62.038 | 1987 | 61.968 | 1986 | 61.709 | 1985 | 61.557 | 1984 | 61.245 | 1983 | 60.985 | 1982 | 60.684 | 1981 | 60.414 | 1980 | 59.895 | 1979 | 59.528 | 1978 | 59.047 | 1977 | 58.488 | 1976 | 57.962 | 1975 | 57.467 | 1974 | 56.875 | 1973 | 56.285 | 1972 | 55.721 | 1971 | 55.121 | 1970 | 54.526 | 1969 | 53.795 | 1968 | 53.266 | 1967 | 52.565 | 1966 | 51.819 | 1965 | 51.114 | 1964 | 50.464 | 1963 | 49.753 | 1962 | 48.811 | 1961 | 48.529 | 1960 | 47.785 |
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